Formula: Pb3Sb8S15
Origin of name: For Bela Fülöpp, Hungarian collector
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Lead-gray; tarnishes bronze or steel-blue
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals short prismatic or pyramidal or thick tabular, striated, often curved
Hardness: 2.5
Specific gravity: 5.23
Cleavage: None
Tenacity:
Streak: Reddish-gray
Synonyms/varieties:
Comments:
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